Dry row fly ash stockyard vegetation restoration composite improved matrix and its application method

Abstract

The invention discloses a composite improved matrix for restoring vegetations in a dry-discharged coal ash storage yard. The matrix comprises the following raw materials by weight parts: 30-60 parts of residual sludge, 10-60 parts of ardealite, 10-30 parts of saw dust or grass meal and 0.5-5 parts of pyrite powder or 0.1-1 part of sulfur. The matrix is prepared by uniformly mixing the raw materials and is suitable for restoring the vegetations in the dry-discharged coal ash storage yard; after the matrix is used to improve surface layer mediums of the dry-discharged coal ash storage yard, the saline-alkali stress in dry-discharged coal ash can be effectively removed, the nutrients of the mediums of the storage yard can be balanced, the vegetations can be quickly constructed and restored, the problems of raised dust, sediment erosion loss and harmful heavy metal release can be remarkably controlled, and the ecological environment of the storage yard can be beautified.

Description

technical field [0001] The invention relates to the technical field of ecological restoration of abandoned industrial and mining lands, in particular to a composite improved substrate for vegetation restoration of dry-discharged fly ash storage yards. Background technique [0002] Fly ash is a mixture of fly ash and combustion by-product bottom slag obtained after the flue gas of coal-fired boilers is collected by dust collectors. Blocky particles. For a long time, my country has been the world's largest coal producer and also the world's largest coal consumer. Generally, every ton of coal burned produces about 0.1-0.5 tons of fly ash. In recent years, my country's thermal power generation has developed rapidly, and the production of fly ash has increased year by year. The annual production of fly ash during the "Tenth Five-Year Plan" reached 302 million tons, and the annual production of fly ash at the end of the "Eleventh Five-Year Plan" reached 480 million tons. It is pr...

AI Technical Summary

Problems solved by technology

It is dark black and has obvious heat-absorbing function, which can easily cause extreme temperature difference between day and night (in the afternoon on a sunny day, the storage yard shows that the temperature of fly ash can reach above 70-80°C, which can directly burn the surface organisms to death), Due to the extreme habitats of the above storage yards, some studies have shown that the actual investigation shows that even if the fly ash is naturally stacked for 20-30 years, the recovery status is still extremely poor. The natural recovery method not only slightly increases the content of organic matter in the matrix, but also has a negative impact on the matrix. Other nutrients did not produce any improvement, and it will take a long time to achieve the goal of improving the nutrient status of the substrate and restoring vegetation by relying solely on natural restoration methods

[0004] However, at the present stage, there are few reports on the research work on vegetation restoration of fly ash storage yards, and on-site restoration application technologies.

Wang Xiaofeng et al.’s research on the vegetation restoration of foreign soil and Zhang Kunying’s long-term (30-40 years or more) natural restoration of dry-row fly ash stockyards showed that vegetation restoration can effectively improve the nutrient conditions of the stockpile medium and effectively control The release of heavy metals in the yard increases the vegetation coverage and biomass, showing obvious ecological and environmental benefits. In addition, the patents "CN101341845A" and "CN101053300A" announced a substrate improvement method and cultivation of turf for vegetation restoration in wet-drained fly ash yards method, but there is no specific technical method for vegetation restoration on the dry-drained fly ash yard. Because the fly ash is wet-drained, a large amount of harmful substances such as salt, alkali, and toxic heavy metals have been contained in the fly ash. Effective leaching of substances can significantly improve the vegetation restoration conditions in the yard, and it is relatively easy to restore vegetation

However, dry-discharged fly ash has the characteristics of significantly higher salinity, more harmful heavy metal ions, and obvious drought; dry-discharged fly ash yards have worse plant site conditions, and vegetation restoration is more difficult. And it is very easy to form dust pollution, which is easy to cause more serious environmental pollution problems